I bought a tohatsu tach for my 90hp. At lower rpm's, it reads all over the place. Once up and going (over 3000rpmish) it reads consistently. I have set it to the suggested pole setting. Does this sound like a pole problem or an interference problem? The booklet with it said with Tohatsu's, sometimes you need to put a .1mf, 100 volt non polarized capacitor between the signal and ground stud terminals due to strong alternator interference. Should i try this?
